How to wah and stuff like that...

I'm a big fan of old vintage synth stuff, especially Keith Emerson, Rick Wakeman, and the old symphonic progrock bands. The QS series seems to be aimed at doing really fine vintage moogy sounds (for a non-modelling synth) especially since Keith Emerson himself designed a number of the patches.

But, there's still one problem, how the hell do I get a patch to wah and talk like you hear old moogs do so that the brightness and lows are cut back (damn Alesis for not putting a highpass filter on this thing) and you get really intense filtering like you would with a guitar wah.

Anyone here famillier with Derek Sherinian (ex-Dream Theater)? He has a lead sound that I'm totally in love with. It's one of the crunchiest, most heavy keyboard leads I've ever heard that wah's like there's no tomarrow and has built in harmonics and feedback that are quite complex, never heard a sound like it before. It's so complex that I thought it was a heavilly screwed with electric guitar until I put 2 and 2 together and realized it was a synth. Now, I know this was done on a modelling synth (Korg Trinity), but is there any way I could get my QS8 to do stuff like that? If you don't know the sound I'm talking about, a good example is his intro to Dream Theater's "Line's in the Sand".